Roof Pitch Conversion Factor

For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1.

Roof pitch conversion factor. On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Roof pitch refers to the slope which the rafter creates. The roof pitch conversion factor is a number that when multiplied by the area covered by the roof gives an estimate the total surface area of the sloped roof itself.

Roof pitch and corresponding angles. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. The roof slope factor chart also consists of conversion factors to determine the slope. In essence a roof pitch chart is provided as a rough guide usually by a roofing company.